Анализ внутренних и внешних помех при диагностике кабелй по характеристикам частичных разрядов

Abstract

На основе проведенных измерений уровня частичных разрядов в силовых кабельных линиях выполнен анализ влияния внутренних и внешних помех на полученные результаты. Показано, что учет особенностей освещения лаборатории, степени ее экранированности, а также качества заземления измерительной аппаратуры приводит к повышению точности определения ЧР.

Based on the measurements of partial discharges in power cable lines analyzed the influence of internal and external interference in the results. It is shown that the inclusion of features lighting laboratory, its degree of the screening and grounding quality instrumentation increases the accuracy of the determination of the partial discharges. It is shown that the method of grounding instrumentation also affects the accuracy of the results. Also considered types of shielded chambers and premises and the materials from which they are constructed. To carry out the tests necessary to apply high-frequency electromagnetic shielded room. Based on the experimental data it is stipulated to the use of incandescent light bulbs as working lights. It is as-certained, that the duration of the measurements also greatly affects the accuracy of the results – the longer an experiment, the effect of noise becomes significant.